lkml.org 
[lkml]   [2021]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 00/25] x86/sgx and selftests/sgx: Support SGX2
From
Date
On 12/1/21 11:22 AM, Reinette Chatre wrote:
> * Support modifying permissions of regular enclave pages belonging to an
> initialized enclave. New permissions are not allowed to exceed the
> originally vetted permissions. Modifying permissions is accomplished
> with a new ioctl SGX_IOC_PAGE_MODP.

It's probably also worth noting that this effectively punts on the issue
of how to allow enclaves to relax the permissions on pages, like taking
a page from R=>RW, or R=>RX. RX isn't allowed unless the page was
*added* originally with RX or RWX.

Since dynamically added pages start with initial RW permissions, they
can *never* be RX or RWX since they did not start with execute
permissions. That's a limitation, of course, but it's one that can be
dealt with separately from this set.

Does that sound sane to everyone?

\
 
 \ /
  Last update: 2021-12-02 19:31    [W:0.428 / U:0.964 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site